Topics¶

The talloc string functions.

Functions¶

_PUBLIC_ void * talloc_array (const void *ctx, #type, unsigned count)
Allocate an array. _PUBLIC_ void * talloc_array_size (const void *ctx, size_t size, unsigned count)
Allocate an array. void * talloc_array_ptrtype (const void *ctx, const void *ptr, unsigned count)
Allocate an array into a typed pointer. size_t talloc_array_length (const void *ctx)
Get the number of elements in a talloc'ed array. void * talloc_zero_array (const void *ctx, #type, unsigned count)
Allocate a zero-initialized array. _PUBLIC_ void * talloc_realloc (const void *ctx, void *ptr, #type, size_t count)
Change the size of a talloc array. void * talloc_realloc_size (const void *ctx, void *ptr, size_t size)
Untyped realloc to change the size of a talloc array. _PUBLIC_ void * talloc_realloc_fn (const void *context, void *ptr, size_t size)
Provide a function version of talloc_realloc_size.

_PUBLIC_ void * talloc_array (const void * ctx, # type, unsigned count)¶

Allocate an array. The macro is equivalent to:

(type *)talloc_size(ctx, sizeof(type) * count);

except that it provides integer overflow protection for the multiply, returning NULL if the multiply overflows.

Parameters

Returns

Example:

unsigned int *a, *b;
a = talloc_zero(NULL, unsigned int);
b = talloc_array(a, unsigned int, 100);

See also

size_t talloc_array_length (const void * ctx)¶

Get the number of elements in a talloc'ed array. A talloc chunk carries its own size, so for talloc'ed arrays it is not necessary to store the number of elements explicitly.

Parameters

Returns

void * talloc_array_ptrtype (const void * ctx, const void * ptr, unsigned count)¶

Allocate an array into a typed pointer. The macro should be used when you have a pointer to an array and want to allocate memory of an array to point at with this pointer. When compiling with gcc >= 3 it is typesafe. Note this is a wrapper of talloc_array_size() and talloc_get_name() will return the current location in the source file and not the type.

Parameters

Returns

_PUBLIC_ void * talloc_array_size (const void * ctx, size_t size, unsigned count)¶

Allocate an array.

Parameters

Returns

_PUBLIC_ void * talloc_realloc (const void * ctx, void * ptr, # type, size_t count)¶

Change the size of a talloc array. The macro changes the size of a talloc pointer. The 'count' argument is the number of elements of type 'type' that you want the resulting pointer to hold.

talloc_realloc() has the following equivalences:

talloc_realloc(ctx, NULL, type, 1) ==> talloc(ctx, type);
talloc_realloc(ctx, NULL, type, N) ==> talloc_array(ctx, type, N);
talloc_realloc(ctx, ptr, type, 0)  ==> talloc_free(ptr);

The 'context' argument is only used if 'ptr' is NULL, otherwise it is ignored.

Parameters

Returns

_PUBLIC_ void * talloc_realloc_fn (const void * context, void * ptr, size_t size)¶

Provide a function version of talloc_realloc_size. This is a non-macro version of talloc_realloc(), which is useful as libraries sometimes want a ralloc function pointer. A realloc() implementation encapsulates the functionality of malloc(), free() and realloc() in one call, which is why it is useful to be able to pass around a single function pointer.

Parameters

Returns

void * talloc_realloc_size (const void * ctx, void * ptr, size_t size)¶

Untyped realloc to change the size of a talloc array. The macro is useful when the type is not known so the typesafe talloc_realloc() cannot be used.

Parameters

Returns

void * talloc_zero_array (const void * ctx, # type, unsigned count)¶

Allocate a zero-initialized array.

Parameters

Returns

The talloc_zero_array() macro is equivalent to:

ptr = talloc_array(ctx, type, count);
if (ptr) memset(ptr, 0, sizeof(type) * count);